Process for producing concentrated aqueous solutions of anionic azo dyes
    1.
    发明授权
    Process for producing concentrated aqueous solutions of anionic azo dyes 失效
    阴离子偶氮染料浓缩水溶液的制备方法

    公开(公告)号:US5508389A

    公开(公告)日:1996-04-16

    申请号:US30280

    申请日:1993-03-26

    IPC分类号: C09B41/00 C09B67/26 D06P1/384

    摘要: If highly concentrated aqueous solutions of azo dyes are prepared directly by diazotization and coupling reactions, appreciable difficulties generally result as a consequence of the fact that the diazotization and coupling reactions give rise to viscous phases which lead to stirring problems in the reaction apparatus used, which in turn results in an incomplete synthesis. The novel process for preparing concentrated aqueous dye solutions of an anionic dye in an aqueous medium overcomes this disadvantage by carrying out the diazotization of the aromatic amine diazo component and/or the coupling reaction between the diazonium salt and the coupling component in the presence of an auxiliary which exerts a viscosity-reducing effect on pasty phases. Examples of such auxiliaries are optionally alkyl-substituted naphthalenesulfonic acid-formaldehyde condensation products, ligninsulfonates, polyacrylates and copolymers of maleic anhydride and methacrylic acid or acrylic acid.

    摘要翻译: PCT No.PCT / EP91 / 01830 Sec。 371日期1993年3月26日 102(e)1993年3月26日PCT PCT 1991年9月25日PCT公布。 出版物WO92 / 06140 日期:1992年04月16日。如果通过重氮化和偶联反应直接制备偶氮染料的高度浓缩水溶液,则由于重氮化和偶联反应产生粘度相导致搅拌问题,导致明显的困难 在所用的反应装置中,这又导致不完全的合成。 在水性介质中制备阴离子染料的浓缩染料水溶液的新方法通过在芳族胺重氮组分的重氮化和/或重氮盐和偶联组分之间的偶联反应在 辅助剂对糊状相施加粘度降低作用。 这种助剂的实例是任选烷基取代的萘磺酸 - 甲醛缩合产物,木质素磺酸盐,聚丙烯酸酯和马来酸酐和甲基丙烯酸或丙烯酸的共聚物。